A synopsis of the nomenclature and morphological features of Pelargonium tomentosum Jacq. (2n=44) is presented. The structure of the trichomes is described in detail and the composition of the essential oil is tabulated. The main components of the essential oil are (-)-isomenthone (61–62%) and (+)-menthone (25–27%), the rest being terpenic hydrocarbons. It is concluded that P. tomentosum has the potential to become a new crop plant for the production of natural peppermint-scented essential oil in South Africa.
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Demarne et al. (1990) studied this question.
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